ASTM D2720-94(2000)
(Practice)Standard Practice for Calculation of Commercial Weight and Yield of Scoured Wool, Top, and Noil for Various Commercial Compositions
Standard Practice for Calculation of Commercial Weight and Yield of Scoured Wool, Top, and Noil for Various Commercial Compositions
SCOPE
1.1 This practice includes, in Table 1, the commercial composition corresponding to different commercial designations for scoured wool, wool top, and wool noil, all of which contain, in addition to wool base, various percentages of moisture, material extractable with alcohol, and mineral matter.
1.2 This practice includes directions for the calculation of the commercial weight of wool corresponding to different commercial designations for several forms of wool, and for converting the commercial weight (mass) calculated on one basis to the commercial weight calculated on a different basis.
1.3 This practice also includes directions for calculating the yield, on various commercial designation bases, obtained by processing raw wool, and for converting the yield calculated on one commercial designation basis to the yield on another commercial designation basis. Note 1-Because of trade practice the term "weight" is used in this practice instead of the technically correct term "mass".
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation:D2720–94 (Reapproved 2000)
Standard Practice for
Calculation of Commercial Weight and Yield of Scoured
Wool, Top, and Noil for Various Commercial Compositions
This standard is issued under the fixed designation D2720; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
TABLE 1 Commercial Composition of Commercially
1. Scope
Designated Scoured Wool, Wool Top, and Wool Noil
1.1 This practice includes, in Table 1, the commercial
Percentage
composition corresponding to different commercial designa-
Other
tions for scoured wool, wool top, and wool noil, all of which
Wool Base Moisture Compo-
contain, in addition to wool base, various percentages of
nents
moisture,materialextractablewithalcohol,andmineralmatter.
A
ASTM Clean Wool Fiber Present 86.0000 12.0000 2.0000
B
1.2 This practice includes directions for the calculation of
U.S. Customs Absolute Clean Content 86.0000 12.0000 2.0000
C
IWTO Clean Wool Content 83.5299 14.5299 1.9402
the commercial weight of wool corresponding to different
D,E
American Oil Combed Top 82.4222 13.0435 4.5343
commercial designations for several forms of wool, and for
D,E
American Oil Combed Noil 83.4113 12.0000 4.5887
D,E
converting the commercial weight (mass) calculated on one
American Dry Combed Top 84.1454 13.0435 2.8111
D,E
American Dry Combed Noil 85.1552 12.0000 2.8448
basis to the commercial weight calculated on a different basis.
D,E
Bradford Oil Combed Top 79.2980 15.9664 4.7356
1.3 This practice also includes directions for calculating the
D,E
Bradford Oil Combed Noil 82.7760 12.2807 4.9433
D,E
yield, on various commercial designation bases, obtained by Bradford Dry Combed Top 82.6449 15.4334 1.9217
D,E
Bradford Dry Combed Noil 85.7260 12.2807 1.9933
processingrawwool,andforconvertingtheyieldcalculatedon
C
IWTO Noble Oil Combed Top 79.2995 15.9664 4.7341
one commercial designation basis to the yield on another C
IWTO Noble Oil Combed Noil 82.7775 12.2807 4.9418
C
commercial designation basis. IWTO Noble Dry Combed Top 82.6469 15.4334 1.9197
C
IWTO Noble Dry Combed Noil 85.7281 12.2807 1.9912
C
NOTE 1—Because of trade practice the term “weight” is used in this Schlumberger Oil Combed Top 79.2995 15.9664 4.7341
C
Schlumberger Oil Combed Noil 81.3503 13.7931 4.8566
practice instead of the technically correct term “mass”.
C
Schlumberger Dry Combed Top 82.6469 15.4334 1.9197
C
1.4 This standard does not purport to address all of the
Schlumberger Dry Combed Noil 84.2500 13.7931 1.9569
safety concerns, if any, associated with its use. It is the A
ASTM Method D 584, Test for Wool Content of Raw Wool, Laboratory Scale.
B
Tariff Schedules of the United States of America (1975), Schedule 3, Part 1,
responsibility of the user of this standard to establish appro-
Subpart C, Headnote 1(c).
priate safety and health practices and determine the applica-
C
IWTO Core Test Regulations, 1974, International Wool Textile Organization.
bility of regulatory limitations prior to use. D
Circular No. 3267, Nov. 10, 1954, Boston Wool Trade Assn.
E
Circular No. 4899, Nov. 2, 1967, Boston Wool Trade Assn.
2. Referenced Documents
2.1 ASTM Standards:
D123 Terminology Relating to Textiles
3.1.1 commercial composition, n— in wool,thepercentages
D584 Test Method for Wool Content of Raw Wool—
by weight of wool base, moisture, and other nonwool-base
Laboratory Scale
components in wool to which a specific commercial designa-
D1113 TestMethodforVegetableMatterandOtherAlkali-
tion is applied. (Compare commercial weight.)
Insoluble Impurities in Scoured Wool
3.1.2 commercial designation, n— in wool, a term applied
D1574 Test Method for Extractable Matter in Wool
to a lot of wool in a stated form, and having a specified
D1576 TestMethodforMoistureinWoolbyOven-Drying
commercial composition.
3.1.3 commercialweight,n—billedweightasdeterminedby
3. Terminology
a generally accepted method or as agreed to by the purchaser
3.1 Definitions:
and the seller.
3.1.3.1 Discussion—For shipments of commercially desig-
nated scoured wool, wool top, or wool noil, the generally
This practice is under the jurisdiction of ASTM Committee D-13 on Textiles
accepted commercial weight is the weight of wool base
and is the direct responsibility of Subcommittee D13.13 on Wool and Wool Felt.
contained in the shipment as determined by definite prescribed
Current edition approved Dec. 15, 1994. Published February 1995. Originally
published as D2720–68T. Last previous edition D2720–90.
methods, plus the weights of moisture and other components
Annual Book of ASTM Standards, Vol 07.01.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D2720
corresponding to the commercial composition of the commer- 5.1.1 The observed composition of a lot of wool to which a
cially designated material. Table 1 lists the common commer- named commercial designation is applied, such as a shipment
cial designations for scoured wool, wool top, and wool noil, of American Dry Combed Top, may and usually does differ
and their respective commercial compositions. from the commercial composition, in which case the observed
TABLE 2 Wool Yield Conversion Factors
NOTE 1—Factors in this table are those generally used by the wool trade in the United States ofAmerica to convert certain commercially designated
estimated yields from one basis to another.
U.S. Customs American Oil American Dry Bradford Oil Bradford Dry
From To
A B B
Clean Yield Combed Yield Combed Yield Combed Yield Combed Yield
A
U.S. Customs Clean Yield . 1.0419 1.0206 1.0790 1.0361
American Oil Combed Yield 0.9598 . 0.9795 1.0356 0.9944
American Dry Combed Yield 0.9798 1.0209 . 1.0573 1.0152
B
Bradford Oil Combed Yield 0.9267 0.9656 0.9458 . 0.9602
B
Bradford Dry Combed Yield 0.9651 1.0056 0.9850 1.0414 .
A
U.S. Customs Clean Yield 5 U.S. Customs Absolute Clean Content minus allowance for processing loss.
B
Thesetermsshouldnotbeconfusedwiththesimilarcommonlyusedterms“BradfordOilCombedTopandNoilYield’’and“BradfordDryCombedTopandNoilYield.’’
The latter terms are based on estimated processing allowances and a ratio of top to noil that are different from those on which this table is based.
3.1.4 oven-dried, adj—the condition of a material that has weight of the lot is adjusted to secure the commercial weight.
been heated under prescribed conditions of temperature and 5.1.2 The commercial compositions are used also in calcu-
humidityuntilthereisnofurthersignificantchangeinitsmass.
lations to convert the commercial weight of a lot of wool
3.1.4.1 Discussion—As the term “oven-dried” is used in having a named commercial designation (for example,Ameri-
this recommended practice, the prescribed conditions are
can Oil Combed Top) to the equivalent commercial weight on
heating to 105 6 2°C in a forced-draft oven supplied with air a different commercial designation basis (for example, Brad-
from an atmosphere having a relative humidity of 65 62%at
ford Dry Combed Top).
a temperature of 20 6 2°C.Atemperature of 20 6 2°C is used
5.2 Calculation of Commercial Weight— To adjust the
in this recommended practice instead of 21.1 6 1°C because
observedweightofalotofwooltowhichanamedcommercial
international testing is frequently involved.
designation is applied to its commercial weight, determine the
3.1.5 vegetable matter base, n— in raw wool, oven-dried
composition of the lot of wool at the time of weighing and use
scouredburrs,seeds,twigs,leaves,andgrasses,freeofmineral
Eq 1:
matter and alcohol-extractable matter.
W 5 O 3 ~b/B! (1)
3.1.6 wool base, n—oven-dried scoured wool free of
alcohol-extractable matter, mineral matter, vegetable matter, where:
and all impurities. W 5 commercial weight of the lot,
O 5 observed weight of the lot,
3.1.7 yield, n—of wool, the percentage of a designated
B 5 percentage of wool base specified in the applicable
commercial composition obtained by processing a lot of raw
commercial composition (Table 1), and
wool. (See also commercial composition.)
b 5 observed wool base content, as a percentage of the
3.1.8 For the definition of wool and other textil
...
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